/*
 * Copyright 2016-2022 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.kafka.listener;

import org.springframework.lang.Nullable;

/**
 * Metadata associated to a {@link org.springframework.kafka.annotation.KafkaListener}.
 *
 * @author Francois Rosiere
 * @author Gary Russell
 * @since 2.8.5
 * @see org.springframework.kafka.annotation.KafkaListener
 */
public interface ListenerMetadata {

	/**
	 * Return the listener id.
	 * @return the listener id.
	 */
	@Nullable
	String getListenerId();

	/**
	 * Return the group id.
	 * @return the group id.
	 */
	@Nullable
	String getGroupId();

	/**
	 * Return the listener info.
	 * @return the listener info.
	 */
	@Nullable
	byte[] getListenerInfo();

}
